In general, I believe you can put water-based paint over oil-based paint / primer, but you should NOT put oil-based paint over water-based paint / primer.

I would recommend going to a REAL paint store (e.g. Benjamin Moore or Sherwin Williams) and ask them for advice. Don't use their "contractor" products. Use their top-of-the-line products. Initially, their top products may cost more, but they will save money in the long run, and they will look fabulous (when properly applied). To guarantee compatibility of paints, primers & sealers, use paint products from the same manufacturer.

Here is a link that might be useful: Exterior Painting How To's - Sherwin-Williams

Thank you Gypsy, you answered my question. I will go to a real paint store for this. I really appreciate you answering the question, rather than giving too many opinions. Don't get me wrong, I thrive on opinions, but I have researched this issue and just needed that information. Thanks again